You can see the standard Atari pins there, which means you can plug a normal joystick into the port for player 2 as well as use it for linking.
Have (2) 9 pin jacks on the unit, Master and Slave (or whatever you wanna call them) The Audio and video pins of both jacks should goto the a/v inputs from the TV.
Hook the Slave jack's control pins to the built-in controls of the unit. Hook the Master jack's control pins to the Player 2 spots of the Atari.
Put a microswitch or something in the cartridge slot. Wire it so when a cartridge is not inserted the Atari cannot turn on by the screen can.
This way the Master unit sends A/V down the link cable and it goes to the TV on the slave unit. Even though the slave unit's A/V is still connected to its Atari the Atari is off so it doesn't matter (I suppose you could use diodes and get fancy)
The slave unit sends its built-in controls back to the Master jack of the other unit, basically becoming a 2nd player joystick with screen.
This keeps a vLink Atari from using a second-player paddle controller. Oh darn. I suppose if you used SVGA jacks you could cram in extra stuff.
Pretty simple really. This pinout is the same I've used since I came up with vLink in 2001, though I don't even think there's more than 5 or 6 units out there with the linking feature. But if you run across one you'll be set!
Note: This cheap/easy technique could work with pretty much any system, especially one like the SNES where all you really need is 3 lines as the other 2 are +5 volts and GND.
Any further questions please direct to my PM's on this board. This is easy stuff though!
